incorrect prefix, exec_prefix in distutils.command.install

[xdegaye]

BPO	38949
Nosy	@merwok, @xdegaye, @dstufft

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-12-09.14:16:57.110>
created_at = <Date 2019-12-01.14:01:26.230>
labels = ['invalid', 'type-bug', 'library', '3.9']
title = 'incorrect prefix, exec_prefix in distutils.command.install'
updated_at = <Date 2019-12-09.14:16:57.101>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2019-12-09.14:16:57.101>
actor = 'xdegaye'
assignee = 'none'
closed = True
closed_date = <Date 2019-12-09.14:16:57.110>
closer = 'xdegaye'
components = ['Distutils']
creation = <Date 2019-12-01.14:01:26.230>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 38949
keywords = []
message_count = 2.0
messages = ['357678', '358095']
nosy_count = 3.0
nosy_names = ['eric.araujo', 'xdegaye', 'dstufft']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38949'
versions = ['Python 3.9']

[xdegaye]

In function finalize_options() of Lib/distutils/command/install.py at

cpython/Lib/distutils/command/install.py

Line 284 in 575d0b4

(prefix, exec_prefix) = get_config_vars('prefix', 'exec_prefix')

(prefix, exec_prefix) is set using get_config_vars(). This may be incorrect when Python has been manually copied in another location from the location where it has been installed with 'make install'. We should use sys.prefix and sy.exec_prefix instead, those values are calculated by getpath.c instead of being retrieved from the sysconfigdata module.

[xdegaye]

get_config_vars() defined in distutils.sysconfig sets 'prefix' and 'exec_prefix' using sys.prefix (resp. sys.exec_prefix) on non nt platforms so there is no problem. Closing the issue as not a bug.